Lugs are used to connect the frame tubes, and are NOT cosmetic. The tubes are first mitered to fit togther tightly, inserted in the lugs, and then brazed to form a firm connection. Think of copper pipe soldering as an analogy. Lugged frames are old school, and have mostly been replaced with TIG welded frames, where the tubing pieces are joined directly. Both methods work well if done correctly.
AFAIK, all Wabi models have the same geometry, so the difference between the Classic and Special are mostly cosmetic.
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